People with disease of the small blood vessels (peripheral vascular disease); and

Women of any age who wear artificial nails (acrylic or "wraps").

Artificial nails increase the risk for onychomycosis because, when an artificial nail is applied, the nail surface is usually abraded with an emery board damaging it, emery boards can carry infection, and water can collect under the artificial nail creating a moist, warm environment favorable for fungal growth.

Alternative names for ringworm of the nails include tinea unguium and dermatophytic onychomycosis.